Blower motor switch help - JeepForum.com
 
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post #1 of 4 Old 07-26-2015, 06:41 PM Thread Starter
ssevdy
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Blower motor switch help

I have a 97 Jeep Grand Cherokee and the blower motor only works if I jumper the dark green wire that goes to the blower switch to ground.
Need to know why there is no ground to this wire. Ware does this wire come from / go to ?? someone please help. Even a complete wiring diagram would help. cant find one.

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post #2 of 4 Old 07-27-2015, 08:33 AM
Uniblurb
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Need to know if you have the manual or ATC (auto temp control)?

On the manual system the power to the blower motor is fed directly via the red wire from motor to fuse 7 (40a) in PDC. Since you have power to the motor this fuse should still be good plus other things wouldn't work if bad.

The blower motor is activated via the ground circuit hence why you aren't see a ground wire at the switch. Actually believe they're all grounds and the dark green wire splices to a black wire going straight to ground. In jumping that dark green wire to ground you're just completing the ground circuit hence then the motor kicks on. Sounds like a bad ground on the blower motor itself or switch is bad.

It should be noted all the speeds on the blower motor go through the blower motor resistor except for high speed. It uses too much power and goes straight to the motor via the black/tan wire from switch to black wire on blower motor.

If you have ATC that's a whole other ball game with lots of other things involved. There's also a blower motor module on the far right side of the box for the ATC.

Below is some info on testing the blower motor switch itself. You should be able to buy this from the dealer as a separate component if bad rather than them trying to sell you the whole control unit. At least you could a couple years ago.

Welcome to the forum!

PS. while not needed in this case it helps to supply your engine (4.0 vs 5.2) along with your model for future questions. Good luck.

Here's the switch test using a meter and the dark green wire should go to the ground cavity.
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96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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post #3 of 4 Old 07-27-2015, 04:28 PM
coralman
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Dang Uni, I'm blind but not that blind

Info on projects and repairs categorized by system

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Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #4 of 4 Old 07-27-2015, 09:28 PM
Uniblurb
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Well coralman it's a HUGE problem!

Lol, dunno why it came out so large and most my diagrams/copied info are between 600-700 pixels wide. That one's 640x736 and just reduced it in my files to 450x518 to make you happy for next time.

PS. had to post and run too!

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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